NEW TRICKS for FIDO (Dec, 1946)
FIDO stands for (Fog Investigation and Dispersal Operations) and seems to consist of using giant flame throwers to burn away the fog…

NEW TRICKS for FIDO
Gliding out of a fog and into fair visibility, a C-47 prepares to land at the Navy’s Landing Aids Experiment Station, Areata, Calif. The flames burning off the mist are part of a new fog-dispersion system called ELMER—a refinement of Britain’s wartime FIDO.
At a central control board, an operator turns on lights and fog-chasing burners at Areata. ELMER has cut the costs of landing a plane in a fog to $150 as compared with the $4,000 average expense of using FIDO.
ELMER, in full glory below, is a line of tri-nozzle heads that atomize Diesel oil under high pressure and shoot curtains of flame into the air on both sides of the runway to vaporize the fog. A hot-wire setup provides instantaneous ignition of the oil.
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